摘要
盆地压力仓的破裂不完全是天然水力压裂作用的结果.基于断裂力学和数值模拟认为,压力仓的破裂包括2种机制:仓内沉积物的天然水力压裂和封闭层的切向牵引张裂.当仓内沉积物天然水力压裂形成的裂缝抵达封闭层的底部时,产生切向强张应力使封闭层张裂.封闭层破裂后,流体将从仓内排出.在一个浅层压力仓中,裂缝张开及流体排出的时间在一个周期内约为10~20a.
The fracturing of the pressure compartments in sedimentary basins may not be caused completely by natural hydraulic fracturing. Based on fracture mechanics and numerical simulations, the authors think that there are two mechanisms concerning the fracturing of pressure compartments: (1) natural hydraulic fracturing of the sediments within pressure compartment, and (2) tensile fracturing due to tangential traction. When the fracture, formed in the sediments within a pressure compartment due to hydraulic fracturing, arrives at the base of the seal, the intensely tangential tensile stresses are created, leading to the fracturing of the seal. After the seal is fractured, the fluid escapes from the pressure compartment. In a shallow pressure compartment, the duration of fracture opening and fluid expulsion is about 10~20a in a cycle.
出处
《地球科学(中国地质大学学报)》
EI
CAS
CSCD
北大核心
1998年第6期595-599,共5页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金
关键词
压力仓
破裂
排液
盆地
幕式排液
油矿床
pressure compartment, fracturing, episodic fluid expulsion.